Chemical Element With the Atomic Number 1
This page is the CodyCross answer for the clue below from London, Group 489, Puzzle 1 (Millennium Bridge).
Question
Chemical Element With the Atomic Number 1
Answer
HYDROGEN
Word Meaning:
HYDROGEN — (uncountable) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008.
Definitions from Wiktionary.